Re: High Power SRSGs

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>


It would be interested to be able to change motors and try it both 
ways. Tune for the most smoke, eh??

DC

Dr. Resonance
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, March 27, 2006 6:37 PM
Subject: Re: High Power SRSGs


> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi DC,
>
> I'm going to try synchronous operation at 120pps and 240pps.  I'm 
> currently getting 7 foot arcs at 2Kwatts with 8 inch 1800rpm SRSG at 
> 120pps and want to make a comparison with asychronous 
> operation.  Since I have a 1/4HP motor,  Im thinking I should not go 
> larger than a 15 inch disc. Yeh, the cap will be more expensive, but 
> what the heck :-))
>
> Gerry R.
>
> > Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
> >
> > I run asynchro with 4 spark gaps at that power level.  We run 3450 
> > rpm with 10 electrodes on 17 inch dia. spacing (18 inch dia wheel) 
> > and get spectacular performance at 7.5 kVA on our 18 inch dia x 52 
> > inch long coil. 9-10 ft sparks at 8-9 kVA.
> >
> > Dr. Resonance
> >
> > ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> > To: <tesla@xxxxxxxxxx>
> > Sent: Sunday, March 26, 2006 4:43 PM
> > Subject: Re: High Power SRSGs
> >
> >
> > > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > >
> > > Hi DC,
> > >
> > > This makes sense as I'm using 1/8 tungsten for this rotary.  The 
> > > next one I'm starting on will use 3/8 tungsten for the flying 
> > > electrodes and maybe 1/2 inch for the stationary ones.  The power 
> > > level using a 5KVA PIG will hopfully be between 5 and 8KVA.   The 
> > > rotor will probably be 15 inches diameter with electrodes on a 
> > > 13.5 inch diameter circle and will also be synchronous at 
> > > 1800rpm.   I'm still debating on whether to use two or four 
> > > stationary electodes.  Im thinking that with four, the gap 
> > > effectively closes and separates at twice the speed and I'm 
> > > wondering if this helps things more than the extra losses thru four gaps.
> > >
> > > Gerry R.
> > >
> > > > Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
> > > >
> > > > Try using 1/2 inch dia. fixed electrodes and you won't get power 
> > > > arcing which results from insufficient cooling at the electrode surfaces ---
> > > > red hot electrode ends promote power arc formation.  I run just 
> > > > two sparkgaps not four with all NST configurations at or below 
> > > > 120 mA.  At 180-200 mA we go to 4 stationary electrodes.
> > > >
> > > > Dr. Resonance
> > > >
> > > >
> > > >
> > > >
> > > > > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > > > >
> > > > > Hi All,
> > > > >
> > > > > The SRSG I built for my NST farm (15KV 120ma) has two static and 
> > > > > 4 flying electrodes and arcs thru two gaps.  The 8 inch diameter 
> > > > > disc runs at 1800rpm (120pps) and the four flying electrodes are 
> > > > > all electrically connected together and rotate on a 6.5 inch 
> > > > > diameter circle .  I have noticed that at the 2KW level, I might 
> > > > > be seeing the beginnings of power arcing.
> > > > >
> > > > > Question:  for higher power levels it is certainly beneficial to 
> > > > > go to a larger disc, but is it also beneficial to have four 
> > > > > stationary electrodes and arc thru 4 gaps??
> > > > >
> > > > > Gerry R.